Evolutionary history underlies plant physiological responses to global change since the last glacial maximum.

Evolutionary history underlies plant physiological responses to global change since the last glacial maximum.
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DOI:
10.1111/ele.12271
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发表时间:
2014-06
期刊:
影响因子:
8.8
通讯作者:
Ward JK
Ward JK
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Becklin KM;Medeiros JS;Sale KR;Ward JK

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评估不同地质时期全球变化的科和物种水平的生理反应变化对于理解物种分布和群落组成变化的因素至关重要。在这里,我们使用稳定碳同位素、叶片氮含量和气孔测量来评估混合针叶树群落叶级生理学的变化,该群落自末次盛冰期(LGM)(21 kyr BP)以来在成分上经历了显着变化。我们的结果表明,自末次盛宴以来,大多数植物类群响应环境变化而降低了气孔导度和/或最大光合能力。然而,植物科和物种在这些生理反应的时间和幅度上有所不同,并且科内的反应比共存的物种组合内的反应更相似。这表明叶子生理水平的适应可能不是群落组成变化的主要决定因素,并且植物进化史可能驱动生理适应最近地质时期的全球变化。
Assessing family- and species-level variation in physiological responses to global change across geologic time is critical for understanding factors that underlie changes in species distributions and community composition. Here, we used stable carbon isotopes, leaf nitrogen content and stomatal measurements to assess changes in leaf-level physiology in a mixed conifer community that underwent significant changes in composition since the last glacial maximum (LGM) (21 kyr BP). Our results indicate that most plant taxa decreased stomatal conductance and/or maximum photosynthetic capacity in response to changing conditions since the LGM. However, plant families and species differed in the timing and magnitude of these physiological responses, and responses were more similar within families than within co-occurring species assemblages. This suggests that adaptation at the level of leaf physiology may not be the main determinant of shifts in community composition, and that plant evolutionary history may drive physiological adaptation to global change over recent geologic time.
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